EXTEENAL CHABAOTBBS AND HABITS 83 (294) thinks that " the constant and powerful exercise of the limbs in the young animal, remaining as it does for many hours each day with the whole weight of its body supported by its four extremities from the body of its mother, must induce a development of the limbs, which can hardly taka place in confinement.'1 When young animals are captured they can be tamed, and even taught to obev words of command. Thev are CJ «J ft not very shy, and they appear to court human society. They are, however, easily frightened, and one of the manifestations of fright is a disturbance of the balance of the ocular muscles. I observed the left eve directed • Bl upwards and inwards, and the right one downwards and inwards, when the small animal was frightened. Distribution.—The Orang is only found in certain parts of the islands of Sumatra and Borneo; and there are problems connected with its distribution which have not been satisfactorily explained. Thus it occurs in two districts, twenty-five miles apart,t but it is absent from the intervening country. Moreover it may be absent from one area, whose climate, trees, rivers and other conditions are similar to those in an area where it thrives well. It frequents dense, gloomy forests and mangrove swamps extending from the coast inland, and avoids mountains and places where the population is dense. Many zoologists have recorded the presence of the Orang in various parts of Sumatra and Borneo, and it will be found, on a perusal of their works, that southwest Borneo and north Sumatra have provided most of the specimens. There is, moreover, evidence that the Sumatran variety has been found in Borneo, and no sharp distinction can be drawn between these forms.